Remember Smack-A-Lot : Zombie? After you manage to smack it real good, zombie falls to the ground and a cockroach starts chewing on it / him / her ... whichever suitable. Thus, Smack-A-Lot : Zombie Cockroach is born!
With the addition of left and right blocking and a score penalty system, this adds that extra 'annoying feature' into the game. Go for the highscore!